Can OEM's be taken out of a current ROM. And a few other noob ?'s

[ThrottleAbuse]

I am as you can tell pretty new to trying to build ROM's. I have used a bunch of different ROM's from different chef's and was wondering if it was possible to take somehow copy a OEM off of a ROM.

Also I have found info on how to turn a .cab into a OEM, but seem to have trouble finding this package creator 5.5 Is this a freeware program or a for purchase program. Also are there any other programs that may be better / easier to use?

I have been using BuildOS and when I go to add different OEM's into the User OEM folder it seems to be having an issue with coping over the iniflash.txt file and the option.xml file etc. Can I leave these OEM's in the user oem folder inside their own folder?

Thanks